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Chapter 2 Faults and Troubleshooting Innovation Series Medium Voltage GP Type - G Drives GEH-6385
No. Name Type Description
169 Frame PLL not OK Alarm
The Frame PLL not OK alarm occurs when phase-lock between the DSPX
control and the System ISBus or (local ACL) is not assured. Detection of the
fault is enabled when the parameter Network interface is configured to select
an interface for which synchronized operation is supported. The presence of
this alarm indicates that data coherency is compromised.
Verify the integrity of IsBus connections and configurations. If this alarm
persists in the absence of any other interface faults, then verify that LAN frame
time is consistent with that of the host, and confirm the absence of overrides,
particularly regarding the Frame phaselock loop and DSPX timebase.
Transient occurrence of this alarm upon initialization of the interface is
expected.